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arXiv 0806.1967astro-ph
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结合弱和强簇透镜:模拟和MS 2137的应用

Combining weak and strong cluster lensing: Applications to simulations and MS 2137

J. Merten, M. Cacciato, M. Meneghetti, C. Mignone, M. Bartelmann

摘要:

目标。虽然弱透镜效应不能解决集群核心和强透镜效应几乎是不敏感的尺度半径以外的密度分布,这两种效应的组合承诺约束星系团的密度分布以及,从而允许测试的CDM期望暗物质晕密度分布。方法.我们开发了一个算法,我们最近提出了这个目的。它恢复了一个透镜潜在的最佳再现观察强和弱透镜效应相结合的集群核心的高分辨率与更大规模的信息从弱透镜。主要的扩展涉及的住宿轻度非线性内迭代,逐步增加的分辨率外迭代,并引入一个合适的正则化项。基本上保持了方法的线性。结果我们证明了该算法的成功与理想化和现实的模拟数据,显示模拟的透镜质量分布和密度分布是很好地再现。然后,我们将其应用到集群MS 2137的弱和强透镜数据,并获得一个参数的解决方案,这是在较早的参数研究的定性协议。

英文摘要:

AIMS. While weak lensing cannot resolve cluster cores and strong lensing is almost insensitive to density profiles outside the scale radius, combinations of both effects promise to constrain density profiles of galaxy clusters well, and thus to allow testing of the CDM expectation on dark-matter halo density profiles. METHODS. We develop an algorithm further that we had recently proposed for this purpose. It recovers a lensing potential optimally reproducing observations of both strong and weak-lensing effects by combining high resolution in cluster cores with the larger-scale information from weak lensing. The main extensions concern the accommodation of mild non-linearity in inner iterations, the progressive increase in resolution in outer iterations, and the introduction of a suitable regularisation term. The linearity of the method is essentially preserved. RESULTS. We demonstrate the success of the algorithm with both idealised and realistic simulated data, showing that the simulated lensing mass distribution and its density profile are well reproduced. We then apply it to weak and strong lensing data of the cluster MS 2137 and obtain a parameter-free solution which is in good qualitative agreement with earlier parametric studies.

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